/*****************************************************************************
 * Copyright (C) Codehaus.org                                                *
 * ------------------------------------------------------------------------- *
 * Licensed under the Apache License, Version 2.0 (the "License");           *
 * you may not use this file except in compliance with the License.          *
 * You may obtain a copy of the License at                                   *
 *                                                                           *
 * http://www.apache.org/licenses/LICENSE-2.0                                *
 *                                                                           *
 * Unless required by applicable law or agreed to in writing, software       *
 * distributed under the License is distributed on an "AS IS" BASIS,         *
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  *
 * See the License for the specific language governing permissions and       *
 * limitations under the License.                                            *
 *****************************************************************************/
package com.googlecode.lazyparsec;

import com.googlecode.totallylazy.Callable1;

final class MapParser<From, To> extends Parser<To> {
    private final Parser<From> parser;
    private final Callable1<? super From, ? extends To> m;

    MapParser(Parser<From> parser, Callable1<? super From, ? extends To> m) {
        this.parser = parser;
        this.m = m;
    }

    @Override
    boolean apply(final ParseContext context) throws Exception {
        final boolean r = parser.run(context);
        if (r) {
            context.result = m.call(parser.getReturn(context));
        }
        return r;
    }

    @Override
    public String toString() {
        return m.toString();
    }
}